These are the fifth and sixth homicides of the year in Cedar Rapids. There were only three homicides all of last year, and three in 2012.

"Obviously, the numbers are concerning. Any amount over zero is too many," Jerman said. "Is there an uptick? I think the numbers speak for themselves, but I don't think it's making the city any less safe."

He said the biggest barrier to solving any homicide is a lack of information. In other words, he said, the people who may know what happened, aren't talking.

"The number one reason that we're hearing is fear of retaliation, and that's where I'd like to re-emphasize the Crime Stoppers number," Jerman said.

Anyone with information about the case is asked to call the Cedar Rapids Police Department at 319-286-5491 or Linn County Crime Stoppers at 1-800-272-7463. Callers may remain anonymous and may be eligible for a reward.